Sand-molding machine.



WILLIAM C. NORCROSS, OF TEE-RE HAUTE, INDIANA, ASSIGNOR To NORCROSS MOULDING MACHINE COMPANY, OF TERRE HAUTE, INDIANA, A CORPORATION OF INDIANA.

SAND-MGL'DING MAGHINE.

Specification of Letters Patent.

Paiteizited Dec. 10, 15907.

To all whom it may concern:

Be it known that I, Wnmniii C. Noncnoss, a citizen of the United States, residing at Terre Haute, in the county of Vigo and State of Indiana, have invented new and usefulImprovements in Sand-Molding Machines, of which the following is a specification.

This invention relates to sand molding machines, and its object is to effect rapi and thorough packing of the sand around the pattern by jarring the support on which the flask rests. lam aware that it has been proposed by others to accomplish this result by various kinds of mechanism, but my invention consists in certain new and simple devices for performing the work, as hereinafter set forth and particularly pointed out in the claims. I

The accompanying drawing is an elevation, hall in section, of my improved molding machine.

On a suitable heavy metal base-plate l is secured the upright cylinder 2, in which is fitted the trunk piston 3 provided at its lower end with a projection, such as a plug 4 preferably of steel, which strikes the baseplate when the piston is at the bottom of its stroke. A pipe 5 enters the lower end of the cylinder and is provided with a stop valve 6. A few inches above the bottom of the cylinder is a plurality of ports 7 connecting the cylinder with an annular chamber 8 surrounding the cylinder. loads from this chamber and is provided with a stop valve 10. Vt'hen the plug 4 rests on tho base-plate, the ports 7 are co cred by the piston, whose bottom stands a little below said ports, as shown in the draw ing. Year the upper end of the cylinder is a safety relief port 11.. V

The table 1.2 is supported by the piston, being prcl'cral l;\' attacl -d thereto by a central boss l3 which enters the upper end of the piston. Hosting on the table a plate 14 to which the pattern '15 is fastened. Surrounding the pattern is a stripping plate -16, lying loosely on the plate 1.4, and stand ing on the stripping plate is the flask 17. A false flask, ring or box 18 is preferably placed on top of the flask 17 to hold loose sand enough to supply what may he wanted. after that in the flask proper has been settled down about the pattern.

At-two or more points around the cylinder An exhaust pipe 9' are located standards 19 risin above the position occupied by the flask W on the sand is being 1packed. On each standard is a collar 20, arjustable vertically thereon and r0- vided with a set screw 21 for clamping it at any desired height. and rotatable freely on the standard is a catch 22, consisting preferably of a plate having a projection 23 on one side.

The operation of the machine is as folloWs:--The pattern is iastened to the plate l4: and the plate is placed on the table 12. he stripping plate 16 is then dropped into Jsition, and the flask and ring are placed thereon around the pattern and filled with sand in any convenient way. The valves 6 and 10 are then opened, admitting fluid pressure through the pipe 5 the ports 7 are uncovered. The sudden escape of pressure through these orts lets the piston drop, and the striking of the plug 4 on the base-p1ate jars the sand down into and around the pattern. ton closes the exhaust ports and permits the lluid pressure from the supply pipe to accumulate and litt the piston. again. This oper-- ation is repeated very rapidly, the strokes approximating three hundred or minute. less than one minute is require to rain the mold, the exact time varying according to the pattern and the flask. After the mold has been rammed sufficiently, both valves are closed, the ring 18 is removed, and the surplus sand is struck ofl". The supply valve is tnen rc-opened, and the piston and its load are raised by a long stroke of the piston .toa height sufficient to permit the catches to. be turned around indeithe edges of the strip ping plate. The port 11 prevents the piston lroni rising too high by relieving the pres- Resting on each collar The fall'of the his I into the space below the piston, which at once rises until sure before the piston has been b own out of the cylinder. The valve 10 is then opened,' and the piston drops, carrying with it the pattern and leaving the mold supported on the stripping plate. The completed mold havingoeen removed, another flask is then placed on the stripping plate, thepiston is raised to pick them up, the catches are valve to open and close the exhaust ports. The combined area of these ports is greater than that of the supply pipe, so that the Serial Number 200,550, filed March 29, 1904.

.Having thus described my invention, what I claim is:

1. In a sand molding machine, means for jarring he mold, comprising an upright cylinder having normally-open fluid pressure supply pipe and exhaust ports, and a piston controlling said ports in its up strokes, and arranged to strike the bottom of the cylinder on its down stroke. 2. n a sand molding machine, means for airing the mold, comprising an upright cylinder having a normally-open fluid pressure su ply pipe at its bottom and a plurality of ex aust ports in its walls, the area of said ports being considerably greater than that of the supply pipe, and a piston controlling saidv exhaust ports and su ported normally by the bottom of the cylin er.

3. In a sand molding machine, means for ja-ri'in the mold, comprising an upright cylinder aving a fluid pressure supply pipe entering it at its bottom, a plurality of exhaust ports 'in its walls, an annular chamber into which said ports open, an exhaust pipe leading from said chamber, stop valves in the sup iy pipe and exhaust pipe, and a piston in t 1e cylinder controlling said exhaust ports.

4. In a sand molding machine, the combiand down l l l l l l nation with an upright cylinder having a supply port in its lower end and exhaust ports at a point above the supply, of a piston fitting in said cylihder and supported normally by the bottom of the cylinder at a point below said exhaust ports and serving to open said exhaust ports when it rises past them, and a pattern-sup orting table carried on the upper end of said piston.

5. In a sand molding machine, the combination with suitable catches, of a table for supporting the pattern and the flask, an upri ht cylinder, a piston therein on which said ta it: rests, and means for giving said piston rapid short strokes striking the end of the cylinder to pack the sand, a long up-s'troke to raise the flask to a position to engage with the catches, and a long down-stroke to withdraw the pattern from the mold.

6. In a sand molding machine, the combination with a table for supporting the pattern and the flask, of an upright cylinder containing a plurality of exhaust ports, a piston carrying said table and reciprocating in said cylinder above and below said exhaust ports and striking the bottom of the cylinder at every stroke, a pipe conveying fluid pressure to said cylinder below said piston, and a regulating valve in said pipe.

7. in a sand molding machine, the combination with an upright cylinder, having a constantly-open supply port in its lower end and exhaust ports at a suitable distance above the supply port, of a piston in said cyl-- inder controlling said exhaust ports, anda projection on the bottom of said piston adapted to strike the bottom of the cylinder. in testimony whereof l have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM C. NURURUSS. Witnesses:

'luos. J. RUAUH, ALBl-Llt'l' M. MITCHELL. 

